Christopher O'Doherty, also known by the pseudonym Reg Mombassa, is a New Zealand-born Australian artist and musician. He is a founding member of the band Mental As Anything and member of Dog Trumpet (alongside his brother Peter O'Doherty).

Mombassa was born Christopher O'Doherty in Auckland, New Zealand, on 14 August 1951.[1][2] O'Doherty, his parents and younger brother Peter immigrated to Sydney, Australia, in 1969. He enrolled in what is now the National Art School in Darlinghurst in 1969 but left the following year. He returned again in 1975 and obtained his Diploma of Painting in 1977. Between and during his stints at college he supported himself with menial jobs such as builder's labouring, cleaning, house painting and working on the railways. In 1976 he formed the rock band Mental as Anything with four fellow art school students,[3] ostensibly to play at school parties. Although they did not initially intend to be a serious band, the Mentals, as they became known, eventually turned professional.

Mombassa's artwork is in two distinctive styles. The type of artwork he designs for Mambo – almost cartoonish and in vivid colours, incorporating religious, political and popular culture themes – is probably the style he is most widely known for.[4] However his landscapes and portraits, many of which are inspired by his childhood in New Zealand, are equally sought after. His artworks can be found in the Art Gallery of New South Wales, the National Gallery of Australia and other important regional galleries. Patrick White, Elton John and Ewan McGregor have all famously purchased his work.